Greasy, puffy yellow vegetable.
The item id for CA Popcorn in unturned is 4081. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Consumeable
Size_X: 1
Size_Y: 1
Size_Z: 0.25
Quality_Min: 50
Food: 35